The book of sun-dials; originally compiled by the late Mrs. Alfred Gatty; now enl. and re-edited by H. K. F. Eden and Eleanor Lloyd (1900)
Gatty, Alfred, Mrs., 1809-1873, Eden, Horatia K. F. Gatty, Lloyd, Eleanor, Evans, Lewis · London, G. Bell · leaf 230
the suns altitudeabove the horizon was the onlybasis of calculation, it was of coursenecessary to know whether the hourwas before or after noon, in orderto learn the time, and this mustalways have been a matter of diffi-culty towards the middle of theday. However, the introduction of the mariners… … CERMAN SHIP DIAI, (sCALE,
Sundials
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